I'm saying this based on anecdotal observations from my biased POV, so take this with a grain of salt. There are income differences, but most are inter-city/region differences. I'd say within a specific city or region, it's low gini, but there's a high gini if you compare cross-region. Income and costs in a village in rural Spain are less than half that of a "mid-tier" city, and less than a third or even quarter of that of Barcelona or Madrid